rhsa-2023_6813
Vulnerability from csaf_redhat
Published
2023-11-08 11:00
Modified
2024-11-06 04:13
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: net/sched: cls_u32 component reference counter leak if tcf_change_indev() fails (CVE-2023-3609)
* kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function (CVE-2023-3776)
* kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags (CVE-2023-3812)
* kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head (CVE-2023-1095)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* netfilter: RHEL 8.8 phase 2 backports from upstream (BZ#2236820)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"cve": "CVE-2023-1095",
"cwe": {
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"name": "NULL Pointer Dereference"
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"discovery_date": "2022-12-16T00:00:00+00:00",
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"system_name": "Red Hat Bugzilla ID",
"text": "2173973"
}
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"notes": [
{
"category": "description",
"text": "A NULL pointer dereference flaw was found in the Linux kernel\u2019s netfilter subsystem. The issue could occur due to an error in nf_tables_updtable while freeing a transaction object not placed on the list head. This flaw allows a local, unprivileged user to crash the system, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-1095"
},
{
"category": "external",
"summary": "RHBZ#2173973",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2173973"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-1095",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-1095"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-1095",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1095"
}
],
"release_date": "2022-08-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2023-11-08T11:00:24+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2023:6813"
},
{
"category": "workaround",
"details": "This flaw can be mitigated by preventing the affected netfilter kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"details": "Moderate"
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"title": "kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head"
},
{
"cve": "CVE-2023-3609",
"cwe": {
"id": "CWE-415",
"name": "Double Free"
},
"discovery_date": "2023-07-24T00:00:00+00:00",
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2225201"
}
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"notes": [
{
"category": "description",
"text": "A double-free flaw was found in u32_set_parms in net/sched/cls_u32.c in the Network Scheduler component in the Linux kernel. This flaw allows a local attacker to use a failure event to mishandle the reference counter, leading to a local privilege escalation threat.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net/sched: cls_u32 component reference counter leak if tcf_change_indev() fails",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc",
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{
"category": "vendor_fix",
"date": "2023-11-08T11:00:24+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
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"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"details": "Important"
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"title": "kernel: net/sched: cls_u32 component reference counter leak if tcf_change_indev() fails"
},
{
"cve": "CVE-2023-3776",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2225097"
}
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"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in fw_set_parms in net/sched/cls_fw.c in network scheduler sub-component in the Linux Kernel. This issue occurs due to a missing sanity check during cleanup at the time of failure, leading to a misleading reference. This may allow a local attacker to gain local privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2023-3776"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-3776",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3776"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f"
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"release_date": "2023-07-06T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2023-11-08T11:00:24+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2023:6813"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module cls_fw from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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"baseScore": 7.0,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function"
},
{
"cve": "CVE-2023-3812",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2023-07-19T00:00:00+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2224048"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds memory access flaw was found in the Linux kernel\u2019s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-3812"
},
{
"category": "external",
"summary": "RHBZ#2224048",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2224048"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-3812",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3812"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-3812",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3812"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0"
}
],
"release_date": "2022-10-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2023-11-08T11:00:24+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2023:6813"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags"
}
]
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.